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Tein H Tech Spring For 04 STI OnlyHigh Tech is made from a new material called "Vanadium" which is much lighter then other spring and increases flexibility. * All spring are designed specifically to fit each car for maximum performance. * About a 1 inch drop for a more attractive appearance. * Comfortable ride quality is still maintained by using the OEM bump rubber and noise protection sheet.(available for most model) * One year limited warranty. * High-grade material adapted to improve guaranteed satisfaction.* Rubber spring protector sheet to prevent noise (most applications). Specification Height: -1.61 inch (front) / -0.94 inch (rear) Specification Spring Rate : 4.5kgf/mm or 250 lbs/in (front) | 3.9 kgf/mm or 220 lbs/inch (rear)